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B KNIGHT.

Time Alarm.

No. 1,780 Patented Sept. 10. 1840.

N, PzTzns, Phnlelilhogmphlc Washington. D c.

UNITED STATES PATENT OFFICE.

BENJAMIN KNIGHT, OF SLATERSVILLE, RI-IODE ISLAND.

MANNER OF APPLYING ALARMS TO CLOCKS AND OTHER TIMEPIEGES.

Specification of Letters Patent No. 1,780, dated September 10, 1840.

To all whom it may concern:

Be it known that I, BENJAMIN Kniorrr, of Slatcrsville, in the county ofProvidence and State of Ithode Island, have invented a new and improvedmode of affixing alarms to clocks and other timepieces, by means ofwhich improvement a bell giving the alarm may be sounded either in theapartment within which the timepiece is situated or in an apartment orapartments distant therefrom; and I do hereby declare that the followingis a full and exact description thereof.

In the accompanying drawing, A, A, represents the lower part of a clock,or timepiece, case, within which there is placed a weight B, on theupper end of an arm 0, the lower end of which arm works on a joint pinat D. The weight B, is held up by a catch, or latch, E, the end of whichbears against a stop at 1*. When the latch is freed from the stop, itwill fall over in the position of the dotted lines, it having slightinclination in that direction. The latch is to be raised by the actionof the time-piece, at. the hour designated, and in a manner to bepresently described. To the arm G, of the weight, there is attached oneend of a cord G, G, the other end of which is afiixed to a bell crank H,and when the weight B, falls the cord will be drawn into a straightline, as shown by the dotted line I, and the bellcrank will be forciblyacted upon.

J, is a wire leading to a second bell-crank H; this part of thearrangement does not differ in any respect from the ordinary mode inwhich bells are hung, and the bell wire therefore may be made to leadinto any apartment, or into several, in each of which an alarm may besounded.

K, is a bell, attached to the spring L, the other end of which spring isfastened to the block M. A wire, N, passes through this block, and toits lower end 0, the bell K, is hooked, the spring being then in a stateof tension. lVhen the wire N, is withdrawn by the action of thebell-crank, the bell will be liberated, and will, if properly fixed,ring with great force, and for a considerable length of time.

The following is the manner of constructing the apparatus by which thelatch E, is raised at the appointed hour: P, is a wheel turning on acenter pin, and having twenty four ratchet teeth on its periphery. Onits face there are twenty four divisions, numbered from 1 to 12, in twoseries, so as to correspond with the twenty-four hours of the day.Against each of these figures there is av small hole, intended toreceive a pin, which is to project out to a short distance, for thepurpose of raising the latch E. A rod, or wire, Q, Q, the upper end ofwhich is acted upon by a pin, or detent, on the arbor of the minutehand, has a catch at its lower end which engages with the ratchet teethon the periphery of the wheel P, and

as the wire Q, is raised every hour by the detent on the minute handarbor, the wheel is turned one twenty-fourth part of its circumferenceevery hour.

1, is the arbor of the minute hand, and S, the detent, or pin,projecting from it.

T, is a wire, or a strip of metal, attached to the arbor U, and whichwire is lifted by the detent S. A second wire, or strip of metal, V, isattached by one end to the arbor U, and by the other to the rod Q, andit will be seen that from this arrangement the required action upon thewheel P, will be attained. The detent, S, must, of course, be made ofthe proper length to raise the rod Q, to the desired distance. By havingforty eight divisions and the same number of teeth on the wheel P, andtwo detents upon the minute hand arbor, the alarm may be set to halfhours. The mode of setting by the insertion of the pin, so as to bringit into contact with the latch at the proper time, is too obvious toneed description.

Having thus, fully described the nature and object of my invention, whatI claim therein, and desire to secure by Letters Patent, is

The arrangement and combination of the parts as within described, forgiving an alarm, by the means of a bell, either near to, or distantfrom, the time piece; said combination consisting of the detent upon theminute arbor for raising the rod Q, the said rod, the wheel P, the latchE, and the falling weight B, with their necessary appurtenances, thewhole constructed and operating substantially in the manner, and for thepurpose, herein set forth.

In testimony whereof I hereunto set my name this twentieth day ofAugust, 1840.

THos. P. Jones, GEORGE WEST.

